Sea-mine of steel-concrete.



N. K. FOUGNER.

SEA MINE OF STEEL CONCRETE. APPLICATION men DEC-6. 19!].

1,275,894. v Patented Aug. 13, 1918.

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N. K. FOUGNER.

SEA MINE OF STEEL CONCRETE APPLICATION FILED ,DEC. 6. 1911.

1,275,894. Patented Aug. 13, 1918.

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NIGOLAY KNUDTZON FOUGNER, 0F CHBISTIANIA, NORWAY.

SEA-MINE OF STEEL-CONCRETE.

Specification of Letters Patent.

Patented Aug. 13, 1918.

Application filed December 6, 1917. Serial No. 205,877.

To all whom it may concern:

Be it known that I, N ICOLAY KNUn'rzoN, FOUGNER, a subject of the King of Norway, residing at Christiana, in the Kingdom of Norway, have invented certain new and useful Improvements in Sea-Mines of Steel- Concrete; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

The present invention has for its object a sea mine (floating mine or submarine mine) of steel concrete and a process for manufacturing the same.

Applicant has found that it is possible to construct hollow bodies of steel concrete which answer to all the requirements with regard to strength, buoyancy and watertightness necessary for sea-mines and submarine mines in particular. In accordance with the invention the hollow mine bodies are produced by means of a lathing of metal iet or perforated sheets of metal, mounted on a form of metal or wood. On the outside of the metal lath is placed a layer of cement or the like, to which is added materials adapted to make the cement watertight. Before this layer of plaster is completely hardened, a wire armament is wound in the form of a spiralor a screw line around the mine body, and this steel wire armanent will be partly embedded in the plaster, forming the exterior surface of the mine. After this armature has been placed in position, a further layer of mortar or the like is added to the mine,-and the interior of the mine body is also supplied with a layer of cement or the like or painted with a suitable paint or tar.

The invention further comprises means for fastening the charge box and the cables and a number of other details which will be specified in the following.

On the drawing Figure 1 illustrates the main part of the mine body in course of construction.

Fig. 2 is a section through the finished mine, and Fig. 3 illustrates on a smaller scale a modified form of fastening the cables.

As seen on Fig. 1 the metal lath forming the main armament of the mine walls is mounted on the inner side of a framework 2, consisting of steel rods, said framework and lat-hing being kept in position by means of exterior wood framing 3. The upper part of the steelrods 2 is bent outwardly, so that the mine body is open at the top. After the armament has been put in position as shown on Fig. l, the mine body is plastered on the outside and the charge box is put in position as illustrated on Fig. 2. Said charge box 41 is supported by two bars 5, 6, which are placed crosswise at the bottom of the charge boxand the undersides of which are curved to fit the inner surface of the mine body. In order to distribute the Weight of the charge box as evenly as possible along the bars, cross bolts 7 are provided between the extreme ends of the bars, preventing the same from expanding laterally when exposed to stress. The bars 5, 6, are cast with their under sides to the inte rior surface of the mine body by means of concrete 8, the charge box being mounted in its exactly correct position through the hardening of this concrete.

The upper side of the charge box is fastened to the mine body by means of stays 9, the upper ends of which are fastened to the wall of the mine body in the same manner as the bars 5, 6. I By fastening the charge box in. this manner, the mine body is nowhere perforated. so that all causes for leakage are obviated. The interior of the mine body may conveniently be coated with tar or similar material. The upper part or cover 10 of the mine body consists of metal netting or rib lath. which may be Provided on its interior surface with a thin layer of plaster 11 and which is also provided with the usual opening 12 for the covering cap of the mine. Along the interior edge of said opening an ironor metal ring 13 is fastened before the cover 10 is put in place on the mine body, said metal ring 13 being provided with bolts 14, projecting through the wall and serving to fasten the frame for the covering cap.

The top part 10 of the mine body is now put in place, and the armament rods 2 are thereupon bent down upon the same, whereupon it is plastered in the same manner as the main part of the mine body. When this operation has been performed, the steel wire armament 15 is wound in a screw line around the whole mine body, and a second v lower ring is connected to the float cable armament of steel rods,'a charge box mount 7 Outside the mine body is now placed a; steel rod or hoop 18, the upper ends of whichmay conveniently be fastened to thecap frame 17. Said steel hoop 18 is provided with eyes 20, 21, serving to fasten the anchor and carrying cables 22, 23. Said cablesmay, however, also be fastened in the manner illustrated on Fig. 3, by'means of two rings 24, 25, placed at a certain distance on opposite sides ofthe equatorial plane'of the mine. The upper ring is con nected to the anchor cable 22, While the or carrying. cable 23. The forked ends of both cables may suitably be guided through eyes inthe fasteningv ring for the other cable. A fender consisting of a thick rope 26 or the like may be placed around the equator of the mine body. By constructing the mine as above described, all stresses on the mine are distributed over the largest possible'surfaces without perforatingthe minewall at any point exposed to stress.

I claim: V A

1. Sea-mine the walls of which consist of metal lathing,*covered by watertight'mortar or concrete and'further provided with a suitable armament ofsteel rods, the mine containinga charge box and having fastening bolts for the anchor. and carrying cables, the charge box and bolts being fas tened to the mine body without perforating the same.

2. Sea-mine the walls ofv whichconsist of metal lathing,. covered by watertight mortar or. concrete and further provided with a suitable'armament of steel rods, a charge box:

mounted on hoops cast to the interior of the minewall, stays, for said charge" box the outer ends of said staysbeing'also cast to the inside of the mine wall.

8. Sea-mine the walls of which consist of' metal lathing, covered by watertight concrete andfurtherprovided with a suitable ed. on hoops castto. the interior of the mine wall, said hoops being provided. with cross rods'in order to prevent lateral expansion;

of the same and. distribute the pressure equally-over the whole length of the hoops.

4. A? sea-mine, comprising metal lathing, rods surrounding the lathing, a concrete covering on.- the lathing and rods, and a' metal hoop on the covering and provided with eyes adapted to receive the anchor and carrying cables.

5.,A sea-mine comprising metal lathing, metal'rods surrounding the lathing, a cap frame to which the lathing and rods are secured, and concrete covering for the whole and having spirally arranged wire embed ded therein. I

6. A sea-mine comprising metal lathing; a skeleton metal frame surrounding the lathing, a layer ofconcrete on the frame and shell and havingspirally arranged wire'embeddedtherein, an outer layer of concrete, and asteelhoop on the outside of the mine and provided with eyes-for receiving the anchor and carrying cables.

7. In the process of producing mines, the forming of the body of the mine by applying metal rods upon metallathing with the rods projecting above the lathing, and applying concrete upon the lathing and the portionsof' the rods below the upper end of the lathing.

8. The herein described process of producing sea mines, consisting in applyinga skeleton metal frame having outwardly bent ends upon metal lathing to form the body of the mine, applying a top to the body, bending theends of the frame upon the top, and applyingreinforced concrete upon the body and'top;

'9. Theh'erein described process of producing sea mines, consisting in applying a skeleton metalframe having outwardly bent ends upon lathing, with said ends projecting above lathing, to form the body of the mine, applying a" metal top having an opening upon the body, bending the ends of the frame upon the top, and'applying reinforced concrete upon the body and'top.

10. The herein describedprocess. of producing mines, consisting in applying a series of metal rods upon a metal lathing with the. ends of'therods projecting above the lathing'to' form the body of the mine, applying a metal cover upon the body, bending therodszon the cover, and applying concrete upon the Whole.

In'testimony that I claim the foregoing. as my'invention, I have signed my name in presence of two subscribing witnesses.

-NIG OLAY 'rrunrzor-ronerra;

Witnesses:

O. FABRIOIUs HANSEN, C. PARMAN.

Copies ofthis patentmay be obtainedjfor; five cents each, by addressing the Commissioner of Patents,

. Washington, D. G. 

